package cn.edu.ssm.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import cn.edu.ssm.entity.User;

/**
 * 登录拦截器
 */
public class LoginInterceptor implements HandlerInterceptor {
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		// 获取Session
		HttpSession session = request.getSession();
		User user = (User) session.getAttribute("USER_SESSION");
		if (StringUtils.isEmpty(user)) {
			response.sendRedirect("loginview.action");
			return false;
		}
		return true;
	} 

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
	}

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
	}
}
